Cmd+F (find) is silently ignored when a MarkdownPanel is the focused panel

[arzafran]

Tracking upstream cmux manaflow-ai#6247 — applicable to our fork but needs a product/scope decision.

Assessment: Confirmed bug: TabManager.startSearch(), findNext(), findPrevious(), hideFind(), and isFindVisible at Sources/TabManager.swift:1220-1289 only dispatch to selectedTerminalPanel and focusedBrowserPanel — no MarkdownPanel branch. MarkdownPanelView already uses .textSelection(.enabled) which activates NSTextFinder internally, so one fix path (wire NSTextFinder via firstResponder) may be low-effort. Needs a product decision on approach (NSTextFinder hook vs custom overlay) before implementation.

Upstream: manaflow-ai#6247

[arzafran]

Decision: Build. Confirmed bug — the five find entry points in Sources/TabManager.swift:1212-1289 only dispatch to terminal/browser panels, no MarkdownPanel branch.

Approach: add a focusedMarkdownPanel branch and wire the panel first responder into NSTextFinder (the view already uses .textSelection(.enabled)), rather than a custom overlay. Cleared needs-decision.

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